Overload (OPP) and overcurrent protection (OCP)
All power supplies should have an OCP as a minimum, although the OCP without OPP may well pose problems. The graphics cards of both manufacturers and also the CPUs are always regulated and limited on a fixed wattage basis. I was able to test this on a laboratory power supply, because the lower the voltage on the 12-volt rail, the higher the current flowing, and the graphics card depends on the product of current and voltage. If you only control the current flow, it can happen that such a power supply (e.g. with aging) switches off much faster than one with normal voltage or even slight overvoltage, which can be dangerous.
Older, especially group-regulated power supplies also have to contend with voltage drops when loads change extremely or there are shifts on the individual rails. Then the 5 volt or 3.3 volt rail can suffer when a hard punch comes through on 12 volts. Something like that swings back and forth and then the UVP also (more rarely) takes effect or the motherboard cuts the power good signal (more often than you think). Then the game is also interrupted for the time being. Especially when the power supply doesn’t shut down completely (usually with a click), the motherboard is usually the cause for the reboot, even if the power supply and its deficits are actually to blame.
In principle, the OPP is certainly always the better solution here in terms of stability, depending on how (and whether) the OPP was actually implemented. There have also been power supplies where there was no real OPP at all and the OEM relied purely on the OCP despite the OPP specification in the datasheet. It can only be verified by professionals anyway. There is definitely also rubbish in circulation – so be careful with even too cheap offers, where the list of protective things is longer than the Nile.
Conclusion
I admit, the 500 watts as a self-imposed limit was pretty close and hard. But it worked! If you can get by with a more frugal CPU, a graphics card class lower (RTX 3060 Ti, RX 6700 XT) and maybe even less, you’ll have a lot to gain with a decent and purpose-built 500-Watt power supply (the be quiet! Pure Power 11 is a nice, exemplary sample) certainly serves completely adequately. The borderline workload thing with a Ryzen 9, RX 6800, and the OC can be done, but it doesn’t have to be.
So rather buy an 600 watt powersupply and you wont have to eat your candy in the dark because the OCP protection triggered and shut everything off. If you want to save a buck and undervolt almost professionally, you could even get away with using less than 500 watts. And to everyone who thinks you could get away with buying a powersupply way under 50 Euros for such an edge-case and hardware, hear my advise: Calculate with some money left so you can pay your insurance too.
The Pure Power 11 600 Watt is only slightly more expensive, but unfortunately was not available to me. The power supply should actually be very similar and only the protection circuits could have been designed a bit more generous. If, I’d probably go for this one if you’re a budding security fanatic. Or just buy something else that meets the requirements, unfortunately I can not test everything and therefore always grab me what is also there and then spontaneously fits to the test.
The Pure Power 11 500 Watt was sent in 2020 by be quiet! for another test without obligation and without conditions and is since then in the archives of the author. There was no obligation to publish and no influence by the manufacturer. The graphics cards used are also from the author’s own collection.
be quiet! Pure Power 11 500W ATX 2.4 (BN293)
Zentrallager: >5 Stück bestellt, wird in 3 Werktagen erwartetFiliale Wilhelmshaven: >5 Stück bestellt, wird in 3 Werktagen erwartetStand: 29.03.24 14:03 | 65,74 €*Stand: 29.03.24 14:05 | |
Zentrallager: Auf Lager, Lieferzeit 2-3 Werktage | 65,75 €*Stand: 29.03.24 13:24 | |
Zentrallager: Auf Lager, Lieferzeit 2-3 Werktage | 66,28 €*Stand: 29.03.24 13:20 |
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